Terraza FWD V6-3.5L VIN 8 (2005)
Ignition Control Module: Description and Operation
IGNITION CONTROL MODULE (ICM)/COILS
There are 3 dual-tower ignition coils mounted to the ignition control module (ICM). The ICM contains coil driver circuits that command the coils to
operate. The ICM has the following circuits:
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An ignition voltage circuit
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A ground circuit
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An IC 1 control circuit for the 1-4 ignition coil
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An IC 2 control circuit for the 2-5 ignition coil
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An IC 3 control circuit for the 3-6 ignition coil
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A low reference circuit
The powertrain control module (PCM) controls each dual-tower ignition coil by transmitting timing pulses on the IC control circuit of the ICM for the
proper coil to enable a spark event.
The spark plugs are connected to each coil tower by spark plug wires. The spark plug wires conduct the spark energy from the coil to the spark plug. The
spark plug electrode is tipped with platinum for long wear and higher efficiency.
